Chair iron



I July 5, 1938.

T. W-FOOTE CHAIR IRON d Filed Feb. l5, 1936 8 Sheets-Sheet 1 Fg-f@ `owms W. Foof'e.

INVENTOR BY mg ATTORNEY July's, 193s. T. Wmo-rE 2,122,565

CHAIR IRON Filed Feb. 15, 1936 8 Sheets-Sheet 2 ntomas fog INVENroR A ATTORNEY July 5, 1938. T. wir-oo'rE 2,122,565

CHAIR IRON Filed Feb. l5, 1936 8 Sheets-Sheet 3 62 L v f5/ ff- Ramas Foofe,

INVENTOR 21 ATTORNEY July 5; 1938. I T- w-F0OTE v 2,122,565

CHAIR IRON FiledFeb. 15, 1936 8 Sheets-Sheet 4 Il .llllll E r E INVENTOR ATTORNEY 5 July 5, 1938. l11 W .FQQTE 2,122,565

CHAIR ,IRON

Filed Feb. 15, 1936 8 Sheets-Sheet 5 v l 3l mamas W Eooe.

xNvENToR avm@ . ATTORNEY July 5, 1938. y T. w.'FooTE 2,122,565

CHAIR IRON' 'l Filed Feb. 15, 19:56 8 sheets-sheet 6 INVENTOR V ATTORNEY July 5, 1938. T W FQOTE 2,122,565

CHAIR IRON Filed Feb. l5, 1936 8 Sheets-Sheet '7 Thoma .W FOOL INVENTOR ATTORNEY.

July 5, .1938. I T. wrom-E l 2,122,565

CHAIR IRON Filed Feb. 15, 1936 8 Sheets-Sheet 8 ffgj.

Thor-via s W. Foc'-e /VV-/VTOR HUUR/WY.

Patented July 5, Y1938 UNITED STATES ,PATENT GFFICE CHAIR IRON Thomas W. Foote, Cleveland, Ohio Application February 15, 1936, Serial No. 64,040

12 Claims.

f in the chair iron construction certain means for adjusting the elevation of the back.

A still further object of the present invention is to improve the construction of the seat used H particularly in chairs of this character, by perforating the seat, its felt padding and covering.

And a still further object of my invention is to provide a self adjustable hinge connection for mounting the back rest on the back of a chair of this character.

I accomplish these objects by means of the various combinations and arrangements of parts hereinafter described, set forth in the appended claims and illustratively exemplifiedin the accompanying drawings, in which,

Figure 1 is a side elevational View of a chair embodying my improved features;

Figure 2 is asubstantially longitudinal sectional view of a chair iron, seat and supporting pedestal taken on lines 2 2 of Figure 3;

Figure 3 is a plan View of the chair iron;

Figure 4 is a substantially transverse sectional view taken on lines 4-4 of Figure 3;

' Fig. 4a is a rear View of the chair iron and chair back, the latter being partly broken away;

Figure 5 is a plan view of a chair iron showing a modied tilting adjustment mechanism;

Figure 6 is a substantially longitudinal sectional view taken on lines 6-5 of Figure 5;

Figure 7 is a substantially transverse sectional View of the tilting mechanism taken on lines 1-1 of Figure 5; v n

Figure 8 is another substantially transverse sectional view taken on lines 8 8 of Figure 5;

Figure 9 is a side elevational view of the chair iron according to Figures '5 to 8;

Figure 10 is a substantially"longitudinal sectional view of still another modified chair iron;

Figure 11 is a sectional view of the same taken on lines II-II of -Figure 10;

Figure l2 is a plan view of a chair iron and its back tilting mechanism according to a still further modication;

Figure 13 is a substantially longitudinal sectional view taken on lines I3-I3 of Figure 12;

. Figure 14 is a plan view of a chair iron and a modified back tilting mechanism;

Figure 15 is a longitudinal sectional View taken on lines I5-I5 of Figure 14;

Figure 16 is a substantially transverse sectional View taken on lines I6-I6 of Figure 15;

Figure 17 is a substantially longitudinal sec tional view of a modified tilting mechanism;

Figure 18 is a transverse sectional view of the same taken on lines I8-I8 of Figure 17; l0

Figure 19 is a rear elevational View of the upper portion of the chair back and back rest;

Figure 20 is a substantially longitudinal sectional view taken on lines 20-20 of Figure 19.

Referring to the drawings and particularly V to Figures 1 to 4, the present invention comprises a chair base A upon which is mounted a chair iron B carrying a back C and back rest D and seat E.

Chair base A The chair base comprises four radially disposed legs I0, a center block II and top and bottom plates I2, which are connected to the ends of a cylindrical bearing I3 projecting through the bore in the base proper. The upper end of f" the rbearing I3 is flared outwardly to form a ange I4 having oppositely disposed radial open ended slots I5. A washer I6 having downwardly disposed teeth I'I is arranged over theange I4 n vand its teeth engage in the slots I5 to prevent@0 turning of the washer. The washer is further provided with an internal tooth I8 to engage in a longitudinal slot I9 cut in the side of a splindle 2D. The spindle is externally threaded and provided with a screw cap 2| having a skirt portion Aembracing the flange I4 and a set screw 22 engaging under the flange to prevent separati-on of the screw cap 2| and flange when the former is rotated to raise and lower the spindle 20 in the chair base. 40

Chair iron B The upper portion of the screw spindle 20 is unthreaded and tapered at its end, which is grooved to accommodate a ball bearing cage 23 43 xed in the upper end ofthe bore of a bearing block 24, see Figure 6. The bearing block 24 is part of a U-shaped casting 25 and consists of an upright cylindrical wall closed at its upper end over the case 23 and a bushing 25 disposed 50 adjacent its lower open end to bear against the unthreaded section of the spindle 20. The spindle is further provided with a groove 21 just above the unthreaded section to receive the inner end of a set screw 28 adjustable in the side of the55 block 24 to project into the groove 21 -and prevent the spindle from being Withdrawn. The block 24- projects upwardly midway between the two arms of the casting 25 and on its face, directed to- 5 wards what is the front of the chair is a pocket 29 Vformed by integral side walls and a bottom wall, the side walls turning towards each other to provide an open ended upright slot 3i).

Mounted upon the upper ends of the arms of l the casting 25 are outwardly curved angle irons 3| which form the spider arms supporting the seat C.

The tilting arrangement supporting the chair V"ing bracket 41 the hand wheel 54 and spindle 53 "are'rotated shifting the guide 52 transversely of l5 back C, comprises, in this particular embodiment,

l a fixed shaft 32, which runs transversely to` the iron, and which is mounted at its ends in the arms of the casting 25 rearwardly of the bearing block 24. Pivotally mounted on the shaft32\ .are the arms 33 of a rocker or bracket, which consists of outside plates 34 with rearwardly projectingarms 35 and bridge piece`35, themidportionofwhich is provided withwa-guideway=31 open towards the y rear. The lower portioneof the. front ofthe bridge piece 35 is provided -with vforwardly I projecting -teeth..38 arranged one'adjacent each end and-below the shait32. Theupper sides of the bracket in vnormal wposition' abut Vtheunder sides ofthe lateral anges ofi-the seatfangleironsl andin order -to -mai-ntain .suflicient tension vupon ethe bracket to bring A'about this.conditionaU-shaped strap 39 is used-the same v--being-arranged.fwith its' arms straddlingthe lupright :bear-ing v.block .and its closed end disposed-in front ofv ther-pocket 29. :The free ends of` the arms lareV groovedto receive :and bear upon-theteet-h 38 and -arefprovided .fwith Aprojections 40 A-onf theirY inner.- sides to embrace the innervsides of the -teeth- 38 to prevent the strap -39- from becoming displaced.

The closed end of the strap 39 is enlarged l0 provided with anffaxialope-ning 4l to accommodate vafbolt.42, the head of which is-dispcsed in the pocket 29 and thethreaded stem of which Wprojects forwardlyunder theseat C. The outer wall of theclosedend ofthe strap 39l is .stepped .up slightly to forma centering seat4'3 for one endof a -helical spring v44, which embraces the .bolt 42 and which is tensionedV at its .outer endby .a washer 45 .and hand wheel 46 adjustable'fover the 'free end of the bolt 42. y v j In addition to the resilient support Vier the tilt- .ing chair back an adjustment thereof provided Y .giving the back any desired -inclinationrelative to the abovedescribedvtilting mechanism. .This adjustmentis accomplished by ,.pivotally mounting a .back carrying bracket 41' between the extreme rearwardends of the armsl35, the pivotal connection being effected by a rotary shaft 4B and hand wheel 49ljournalled inthe arms 35. `The bracket '41.ce'rnprises acylindric`al portion, '.thebore of e0 which accommodates the shaft48 andajforw'ardly projecting follower wing 55 terminating 'in a flared portion inclined-with 'respect to the horizontal plane and-beingprovidedwith ,a trackw closelywadjacentthe -open'sidevof the gui-dewayf'l'. The trackt55' is .guided in anrinclined ,groove 5l-oan adjnstableguide-52 which traVersesthe eguidewayf31-fover athreaded spindle 53.5.Ti1he f Tvspindle 53 is journalledin theends vof the rbracket consistingfof the bridge piece=35and piates34 and v runs -axiallytofthe -guidewa'y :31,- the outer-end lof the spindle-53 at one side 'having ahandfwh'eel -54. W Y

The bracket '41 `on its rear facefcarries spaced `lugs f 55 kprovi-:led with opposite fveshaped'l grooves .75 N56 'to form .a vertical iiguideway. '.Midway the length of the cylindrical portion the bracket is grooved to afford a passage 51 traversing the bore in the said cylindrical portion. A pinion gear 58 is keyed to the rotary shaft 4E and projects into the passage 5'! to mesh with a rack 59 guided therein. The rack 55 is integral with a slide plate 50 having beveled sides to slide vertically in the V-shaped grooves 55 (see Fig. 4a). A shield 53 is carried by the plate 50 to cover the rack 59 when the latterprojects above the seat and to act lo as a Vstop to limit "downward motionjof the plate 60. -To adjust the inclination of the back supportthe iron and in so doing the track 50' of the iollower V50 1'is raised or lowered and with it the q bracketfll'l which turns on the shaft 48 and causes Chair. back C Referring Vnow to the 'chair back, thelatter comprisesva *slightly curvedy plate f 5 l arranged upright on foneof its longitudinal sides and provvided with a straight mid1porti0n vwhich is-inte- -Ygrally attached to thefplate-. "The extreme outer endsof the platel'carrythe' lowerends 0f 1an inverted'U -shaped :wod piece-52 constituting ltheiback frame oftheY chai Back rest ...D

,The *back "rest 'according to.'..the .presetX em- '.Ibodimentcis-mountedion' theclosed upper end of 'the' 'back' frame 62 :andco'mprises a'. padded .later` ally curved member 63, whichxisziunder tension 40 ein its mountin'gs totilt*slightlyftorward at its :.upper edge. Y Y

The mountings 'for "therest consists of two 'spaced' angle'bra'ckets 64' (seefEig. 20) mounted on the closed eridor cross .piecefof ythe frame. 4:5V

.screw 58 lwhich projects into fan opening inthe zshell. .Thefollower G'Visarranged b'etweenthe 55 sides of the :strap '59 which 'embraces the 'shell :661and is-*attachedto'the backof the back rest'63.

.Chair seat E V`Arranged upon `theftangle .irons:3| oflthe seat 60 spideristhe seat lproperwhiclrconsi'sts of a'suitably shaped foundation board 10, a layer'of padr-ding-y orflle'rffl andcovering #12. The fsea't is furtherlprovided' with" aviplurality-pf uniformly spaced-"vent holesf3 which projectythrough the G5 the recessed free ends of the strap 39 are adapted to bear. Side plates 16 form integral parts of the bracket 14 and project rearwardly to pivotally support a chair back bracket 11 by means of stub pins 18 projecting from the plates 16 into openings in side pieces of the bracket 11.

The forward ends of the side walls or plates of the bracket 11 are provided with projections Silextending forwardly from the lower corners to support a fixed shaft 8| therebetween. The shaft 8| projects through the end pieces 82 and adjacent the closed end of an upright U-shaped cam plate 83, which extends between the plates 16. The cam plate 83 is pivotally connected with the back bracket 11 through the shaft 8| and the plate is raised and lowered byV means of cam follower 84 riding in parallel inclined slots 85 of the cam plates 83. The cam follower 84 is provided with a threaded bore disposed transversely thereof to traverse a threaded spindle 85 which is rotatably mounted in the side plates 13 of the bracket 14, one end of the spindle projecting outwardly at the side of the chair iron to receive a hand wheel 88. In operation, adjustment of the cam follower 84 along the spindle 85 will cause the cam plate 83 to be raised or lowered and with it the back support 11, which will swing about its pivots 18.

The back support 11 carries means for adjusting the elevation of the back with respect to its tilting arrangement, such means in the present modification comprising a cam having side plates 81 pivotally supported on a fixed shaft 88 disposed between the side pieces 19 of the back supporting bracket 11 and provided with rear wardly arched parallel cam plates 89 projecting between the plates 81. The cam plates 83 have 'parallel inclined cam slots 9D to accommodate a cam follower 9| which is adjustable along a threaded spindle 92 rotatably carried by the back supporting bracket sides 19 and provided with a hand wheel S3 at oneend. The side walls 81 are arcuately slotted at 94 between the cam plates 89 to accommodate the intermediate portions of the spindle 92. The side plates 16 are also slotted at 95 to accommodate the projecting portions of the spindle 92 and allow relative movement thereof with respect to the bracket 14.

The rear free ends of the side walls 81 of the cam are provided with recesses 93 which receive the teeth 91 of a vertically adjustable plate 98 Vdisposed between the sides of the bracket 11 and provided with a clamp screw 89 which projects rearwardly through an upright slot |98 in closed back wall of the bracket 11 and carries two slide plates |81 and a hand wheel |82 and lock washers |83. The plates ll'll are integral with the cross piece 6| of the vchair back. In operation the cam follower 9| is moved through the cam slots 98 to swing the cam about its pivotal axis or shaft 88 and the teeth v91 engaged in the recesses 35 are adjusted vertically and with them the plates 88 and IDI, clamp screw 39 and y crosspiece 6| of the chair back.

Referring now to the chair ironfillustrated in Figures l and 11, spider irons |04 of the seat are rigidly connected to the upper ends of the arms |85 forming a U-shaped strap' |06, which lcarries an upright cylindrical bearing |81 for the swivel spindle |88 of the chair base. The strap |83 and spider irons |84 are raised and lowered with the seat by means of a screw spindle |59 turning in the threaded bore of an upright block H8 integrall with the strap |86. The screw spindle |09 is carried on a bracket arm held on the swivel spindle |08 and is rotated to adjust the elevation of the seat by a hand wheel ||2 keyed to the spindle |89.

The back supporting members, in this modication, comprise side plates ||3, bridge piece |15. attached at its ends to the plates and a pivotal connection ||5 between each vertical flange of the spider arms |84 and the forward upper corner of each side plate |13. The back support is resiliently supported in its uppermost position by means of helical spring ||6 seated at its up per end against the under side of the bridge piece H4 and at its lower end against a washer l1 and hand wheel ||8 which is adjustable vertically over a bolt ||9 projecting axially of the spring ||6 and opening in the bridge piece H4. The back support is limited in its uppermost positicn by a tie plate |28 fixed at its ends to the vertical anges of the spider irons |84 and hav-4 ing a square opening |2| in its mid portion to receive the squared shank |22 of the bolt ||9, the latter having its head |23 resting upon the tie plate 20.

The rearwardly projecting ends of the side plates ||3 carry pivot pins |24 upon which the side arms |25 of a U-shaped strap |26 are pivotally supported, the strap |26 being adapted to carry the back proper. Adjustment of the strap |26 about its pivotal axis to tilt the back is effected through a pair of cam plates |21 turning with a rotary shaft |28, which is journalled in the side plates ||3 in the corner thereof below the pivotal axis H5, and which carries a hand wheel |29 at one end. The cam plates |21 are provided with corresponding spiral cam slots |38 in which followers |31 ride, the followers being arranged at the forward ends of the sides of the back strap |28, so that as the plates |21 are revolved the cam slots thereof will cause the forward ends of the back strap |26 to be raised or lowered about the pivotal axis of the pins |24. Thus the back supporting strap is tilted with respect to the resilient supporting elements I3, I4 for the back.

In Figures i2 and 13, the back supporting medium comprises a pivotally mounted bracket E32, which is resiliently supported by any one of the arrangements heretofore described, and which comprises side plates connected to the ends of a cylindrical tie block |33. The block |33 accommodates a shaft |34 in which gear teeth |35 have been cut, the teeth being accessible through a transverse slot |38 in the block. One end of the shaft |34 carries a hand wheel (not shown). The rear ends of the bracket |32 carry a cylindrical bearing |31 upon which is mounted the hub |38 of a segmental gear |39, the latter projecting forwardly and having its teeth moving through the slot |38 to mesh with the teeth |35. Spaced guide lugs |48 integral with hub |36 and projecting above and below the latter are provided with guide grooves 4| in which a plate |42 is vertically adjustable, the plate having a rack |43 projecting into a slct in the hub |38 and bearing |31 to mesh with a toothed portion 'Hifi of a shaft |45 which is rotatably mounted in the bore of the bearing |31 and carries a hand wheel (not shown) at its outer end. A set screw $8.3 in the upper end of the rack |43 limits the latter from being lowered beyond a certain point.

Referring to the modification illustrated in Figures 14, and 16, |41 denotes the U-shaped strap which is resiliently pivctally supported,

like strap |26 in Figures 1-0 and 11, to hold the back upright and |48 designates a pivot rod carried by the side plates of the strap |41 closely adjacent the closed end thereof. A. back supporting U-shaped strap |49 is pivoted upon the ends of the rod |48, the arms |50 of the strap |49 embracing the sides of the strap |41 and at their free ends a bearing rod |52 is mounted, the ends of the rod being fixed in the arms of the strap |49 below the rst strap |41. Directly over the rod E52 is a second bearing rod V|5| carried at its ends in the side plates of the strap |41. Mounted upon the rods 5| and |52 are guide jaws |53 and |54 respectively, the tracks |55 of which project towards each other at one side of the iron. A wedge block |56 with guideways l 51 in its opposite sides to embrace the tracks |55 is adjustably mounted between the opposite inclined surfaces of the jaws |53 and |54 on a scr'ew spindle |58 rotatably mounted in one side of the strap I|41 and provided with a .hand wheel 4|59 at its 'outer end. The wedge block |56 trav- 'ersing the screw spindle |58 causes the jaws to move relatively to each other and the back supporting strap V|49 to tilt to any desired inclina- Y tion.

In Figures 17 and 18, the straps |60 and |6| are pivotally connected by the rod |62, as in the previous modification, but in this arrangement the screw spindle 63 is carried in the back supporting strap 6|, beneath the first strap |66. One end of a universal coupling |64 traverses the screw spindle |63 and its other end is provided with an inclined bore |65`which moves over an inclined shaft or bar |66 carried at `its ends in the side plates `of the iirsty strap |60. Movement of the coupling |64 along the spindle |63 and rod |66 causes the pivoted back supporting strap Ato tilt with vrespect to the first strap |60.

I claimz- Y v l. In a chair iron,.the combination of a block to support a seat frame, a bracket pivoted on said block, spring means to hold the bracket in its normal position, a back support pivoted in said bracket and provided with an inclined track, and means adjustable transversely Vof the bracket and support to engage said track and adjust the inclination of the backvsupport about its pivotal axis.

2. In a chair iron,'the combination of a block to support a seat frame, a b-racket having side arms and a cross member intermediate the ends of said arms, said bracket being pivoted on said block, a spring means arranged betweensaid bracket and said block and being adjustably tensioned to yieldably hold the bracket in a predetermined position, a rotary threaded spindle disposed transversely in the bracket and carrying a guide means traversing the spindle, a chair back supporting member pivotally mounted on the arms of the bracket and provided with an inclined follower engaged in the guidemeans to be moved by the latter in itsfmovement over the spindle and to adjust the inclination of the chair back supporting member about its pivotal axis.

3. In a chair iron, the combination of a block to support a seat frame, va 'bracket tiltably mounted on said block meansto yieldably hold said bracket in a predeterminedfposition, a back supporting 'member journalled in said bracket, adjustable means to change the inclination of said member, a rotary shaft arranged at the pivotal axis 'of said back supporting member and -provided with a "p inionand a rack carrying a back4 adjustably mounted insaid supporting member, said rack being in mesh with .the pinion to effect the elevation ofthe back connection by rotary adjustment of said shaft.`

4. A chair iron, asclaimed in claim 2, including further a spindle mounted atthe pivotal axis of the chair back supporting member and provided 'with a pinion, a slide plate guided in said back* supporting( member andfprovided with a rack in mesh with said pinion, Vwhereby rotation of the latter will adjust the yelevation of the plate, and chair back carried by said plate.

5. A Yswivel chair, comprising a chair base, a spindle projecting vertically from said base, a cylinder-shaped block rotatably supported on the upper end of said spindle, a chair iron rigid with said rotatable block, ya 'titling bracket pivotally mounted on said block rearwardly of the turning axis thereof, an adjustable spring means mounted on said block forwardly of the turning axis thereof, an intermediary member movably engaging the spring means forwardly ofthe turning axis of the block to transmit the tension vof saidrspring to said bracket in'order to keep the latter yieldably in a vpredetermined position, said intermediary member embracing said block and projecting rearwardly into engagementwith said bracket, and supporting means for a back rest carried by the tilting Ybracket and adjustable with respect thereto.

6. A swivel chair, as claimed in clairn, comprising `further a ball-bearing between the upper end Vof said spindle and said cylinder-shaped block. Y

7. In a chairiron, the combination lof a block to support a seat frame, a .bracket pivoted on said block, spring means vto .hold the bracket yieldably .in a predetermined position, a back support pivoted in said bracket, an inclined track and a guide having an inclined groove provided on rsaid back support and in said bracket respectively, and means yto adjust the Vvtrack and Iii the grooved guide relative to each other transversely of the bracket and support, whereby the back support is inclined about its Vvpivotal axis.

8. In a chair iron, the combination of ablock yto rsupport a seat frame, a bracket tiltably mountedon said block and provided with a rotary screw spindle disposed transversely therein, means to yieldably hold said bracket in a predetermined position, aback supporting member journalled in said bracket, an upright cam plate pivotally connected with -said member-and havvingvan inclined cam slot adjacent" Ysaid screw spindle, and a follower traversingl the spindle and riding in said cam slot to raise and lower the cam plate andchange the inclination of the back supporting member.

9. In a chair iron, the combination ofa block to support a seat frame, .a bracket `tiltably mounted on said block/andpro'vided with a rotary screw spindle disposed transversely therein, means to ,yieldably hold said bracket in a predetermined position, -a back supporting member journalled in said bracket, saidback supporting member comprisingtwo yside plates and a rearwardly arranged cross piece, an upright U- shaped cam plate embracing the spindle said cam platehaving its closed end pivotally connectedto the open forward end of said back supporting member and its upright sides provided with parallel inclined cam slots, a follower traversing said spindle and riding in thecam slots, and means to adjustably lmount a chair ,back on said back supporting member.

10. A chair iron, as claimed in claim 9, in which said means to adjustably mount the chair back, comprises a second cam element including a curved cam plate and being mounted in said back supporting member adjacent the open end thereof pivotally about an axis transverse of the side plates of said back supporting member, said curved cam plate being disposed transversely between said plates and provided with a cam slot disposed transversely of said chair iron and at an inclination to the horizontal plane, a follower engaged in said cam slot, a second screw spindle carried by said back supporting member transversely thereof and over which the follower is movable, and a back connecting plate adjustable in the 'closed end of the back supporting member and having a projecting lug to engage in a notch in the rear edge of said second cam element at the free end of the latter to translate the arcuate movement thereof into a Vertical adjustment for the back connecting plate.

11. In a chair iron, the combination of a base, a block rotatably mounted on said base to support a seat frame, a bracket having side arms and a cross member intermediate the ends of said arms, said bracket being pivotally mounted on said block rearwardly of the turning axis thereof, and provided with laterally spaced forwardly directed projections, a U-shaped strap surrounding the block and seated at its ends on said projections, a bolt carried by the block forwardly of the turning axis thereof and projected through the closed end of the U-shaped strap, a spring embracing the bolt and bearing against the strap at one end, a hand wheel adjustable over said bolt and against the other end of the spring to tension the latter and yieldably support the bracket, a back support pivotally mounted on the arms of the bracket and provided with an inclined track, and guide means movable transversely of the bracket and engaged with said inclined track.

12. In a chair iron, the combination of a block to support a seat frame, a bracket tiltably mounted on said block and provided with a guideway, means to yieldably hold said bracket in a predetermined position, a guide in said guideway, said guide having an inclined groove therein, a screw spindle mounted transversely in the bracket and engaging the guide to cause the latter to traverse the guideway, and a back supporting member journalled in said bracket and provided with a follower having an inclined track riding in the grooved guide, whereby movement of the latter along said screw spindle will cause the back support to take an inclined position corresponding to the position of the track in the groove of the guide.

THOMAS W. FOOTE. 

